PhotoConverter.cs

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using System.Collections.ObjectModel;
using System.Linq;
using PhotoSharingApp.Portable.DataContracts;
using PhotoSharingApp.Universal.Models;

namespace PhotoSharingApp.Universal.ContractModelConverterExtensions
{
    /// <summary>
    /// Helper class to convert between <see cref="Photo" />
    /// and <see cref="PhotoContract" /> classes.
    /// </summary>
    public static class PhotoConverter
    {
        /// <summary>
        /// Converts the given data model into a photo data contract.
        /// </summary>
        /// <param name="photo">The data model.</param>
        /// <returns>The photo data contract.</returns>
        public static PhotoContract ToDataContract(this Photo photo)
        {
            var photoContract = new PhotoContract
            {
                Id = photo.Id,
                CategoryId = photo.CategoryId,
                CategoryName = photo.CategoryName,
                ThumbnailUrl = photo.ThumbnailUrl,
                StandardUrl = photo.StandardUrl,
                HighResolutionUrl = photo.HighResolutionUrl,
                User = photo.User.ToDataContract(),
                Description = photo.Caption,
                CreatedAt = photo.CreatedAt,
                NumberOfAnnotations = photo.NumberOfAnnotations,
                NumberOfGoldVotes = photo.GoldCount,
                Status = photo.Status
            };

            return photoContract;
        }

        /// <summary>
        /// Converts the given contract into a data model.
        /// </summary>
        /// <param name="photoContract">The data contract.</param>
        /// <returns>The data model.</returns>
        public static Photo ToDataModel(this PhotoContract photoContract)
        {
            var photo = new Photo
            {
                Id = photoContract.Id,
                CategoryId = photoContract.CategoryId,
                ThumbnailUrl = photoContract.ThumbnailUrl,
                StandardUrl = photoContract.StandardUrl,
                HighResolutionUrl = photoContract.HighResolutionUrl,
                User = photoContract.User.ToDataModel(),
                Caption = photoContract.Description,
                CreatedAt = photoContract.CreatedAt,
                NumberOfAnnotations = photoContract.NumberOfAnnotations,
                GoldCount = photoContract.NumberOfGoldVotes,
                CategoryName = photoContract.CategoryName,
                Reports = photoContract.Reports,
                Status = photoContract.Status
            };

            if (photoContract.Annotations != null)
            {
                photo.Annotations = new ObservableCollection<Annotation>(
                    photoContract.Annotations.Select(a => a.ToDataModel()));
            }

            return photo;
        }
    }
}